Patent GB-190705894-A (GB)
Title: Improvements in Apparatus for Polishing, Pumicing, Varnishing, and like purposes.
Inventor: COURTOIS GABRIEL FRANCOIS
Filed: 1907-03-11
Granted: 1908-02-06
Abstract: 5894. Courtois, G. F. March 11. Polishing, french and like; varnishing.-Relates to a tool for use in polishing, pumicing, varnishing, and similarly treating wood, stone, marble, metal, &c., which comprises an elastic piece formed of a metal flexible plate or its equivalent supporting a soft felt &c. backing and the working surface, and also to a machine in which the pad can be used, which gives to the work a planetary motion and also a slow longitudinal reciprocal motion and to the pad a transverse reciprocal motion to imitate the movements of hand-polishing. The tool comprises a base-plate 1, Fig. 1, having means at the ends, comprising rods 3'fitting into sockets 2 and secured by screws 5, to clamp in position the felt backing 7 and the working. surface 6, which may consist of linen sheets saturated with polishing- matter or of sheets of emery, glass, &c. paper, &c. according to the operation to be performed. The working surface is supported by the flexible metal plate 8, the ends of which are held in the plate 9 and the pressure of which may be adjusted by screws 10. Liquid polishing-material may be held in a hollow 18 in the plate 9 and escape to the working surface through holes in the metal plates. The base-plate 1 is secured to the tang 11, which may be attached to a handle 11<1> or to the support in the machine by a dovetail connexion, one jaw 14 of which is loose and can be clamped by a key 15 acting on a screwed bolt 16. The support 11 is thus adapted to receive several different pads in succession to accomplish the various operations specified. Fig. 4 shows a tool in which a spiral roll of felt &c. supported by a flexible metal plate 20<1> is clamped by two semicircular pieces 24. The work is held on a table 37, Figs. 6 and 7, carried by two supports 33 connected by cross-pieces 32 and reciprocated on friction rollers 29', 30', 31<1> along ways 29, 30, 31 on the frame 28 of the machine by a screw 36 working through a nut 35 carried by a central support 34. The screw 36 is driven by band from a crank 106, or automatically from fast and loose pulleys 44, 43, mounted on a shaft 42 in alinement with the screw 36, through bevel-wheels 39, 40, 38. A clutch 41 splined to the screw engages either the bevel-wheel 39 fixed on the shaft 42 or the bevelwheel 38 loose on the screw to reverse the direction of rotation. The movement of the clutch is accomplished by a weighted pivoted lever operated through a depending fork 51 and second pivoted lever 53 by a rod 55 moved by a projection 60 on the centrepiece 34 coming into contact with stops 58 on the rod at the end of each traverse of the table. The circular motion is given to the table, which is mounted on ball bearings 71, by cranks 62 on vertical shafts 63 driven by bevelgearing splined to a shaft 67 which is driven continuously from the shaft 42. The tool is carried at the end of an arm 72 slidably supported on a vertically adjustable bracket 102. The arm 72 is moved forward intermittently across the table at the end of each traverse of the table by a rack 74 and pinion 75. The motion of the pivoted lever 53 to effect the reversal of the motion of the table operates connecting-rods 85 having pawls to operate a ratchet-wheel 88, which drives through bevel-gearing 89,90 a vertical shaft 83. This drives through bevelgearing the shaft on which the pinion 75 is mounted. The reversal of the direction of traverse of the tool is effected by a splined clutch 84 engaging one or other of the bevel pinions 80, 81 loose on the shaft 79. The clutch is moved by steps 96 on the rod 97 operating a weighted pivoted lever 91 which engages the clutch. The tool is mounted in a vertically adjustable support 73 at the end of the arm 72, and is pressed down on to the work by a weighted lever 99 pivoted to the arm 72. A spring-operated pin 101 is provided to hold the tool support above the work when it is not in use.